Water level control



A ril 12, 1932. E. s. HALL ET A 1,853,859

WATER LEVEL CONTROL Filed March 12, 1950 2 Sheets-Sheet l 34 Fig.5.

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by Ph'fZ/Li/pa April 12, 1932. ES. HALL ET AL WATER LEVEL CQNTROL Filed March 12, 1930 2 SheetsSheet 6? LmZoZ/ E 2 7211176 195. wy 4 Patented Apr. 12, 1932 UNITED S' rA'r Es PATENTOFFICE EDWIN SHERMAN HALL, on ARLINGTON, ED'WAED w. BLUE, on AUBURNDALE, AND REGINALD E. PHILLIPS, OF EAST WEYMOUTH, MASSACHUSETTS; AssIeNoRs, TO

MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS WATER LEVEL coNTnoL Application filed March 12,1930. Serial No. 435,119.

Thisinvention relates to a waterlevel control particularly adapted to be used in cone nection with boilers, the object being to provide a simple and efficient devicewhereby the water in a boiler maybe kept at a normal, level. v I

The invention consists of an apparatus of the character hereinbefore set forth, in which a closed casing is connected by two pipes, one 1o entering the boiler above the normal level. of the water therein and the other entering the boiler below the normal level of the water in the boiler. In this closed casing there. are

two valves, one an inlet valve, which is connected to a source of water under pressure, the

other an outlet valve, which is'connected to an outlet pipe leading to any suitable outletor container. Both of these valves are sub-' merged in the water in the casing and they are both operated by the same float locatedin the casing and connected to the inlet and outlet valves in such a manner that when the level of the water in the casing rises above the normal, the outlet valve will be opened while the inlet valve will be closed, and when the levelof the water in the boiler descends below the normal, the inlet valve will be opened to admit water into the casing and closed when the 7 water rises in the casing to the normal level. V 135 Counter-weights are provided whlch operate and outlet valves and of the counter-weights and of the counter-weight levers and the float lever. A v 1 Fig. 3 is a front elevation partly in section of the inlet and outlet valves and the mechanism by which they are operated, being a similar view to Fig. 1, but'illustrating the inlet valve opened and the outletvalve closed, Fig. 4 is a sectional elevation broken away '50 and similar to Fig. 3, except that the inlet STERLING ENGINEERING- AND MANUFACTURING CORPORATION, OF HYDE PARK,

valve is shown closed and the outlet valve opened- Like numerals refer tolike parts in the several views of the drawings.

In the drawings, 5 is a casing closed by a cover 6 and providedwith a steam inlet pipe 7 near the top of the casing and entering the casing above the normal level of. the water indicated by the line A-A. The casing is also provided with a water inlet pipe 8 which enters the casing at the bottom thereof. The pipe? leads to a boiler, entering thelsame above thenormal level of the water in the.

boiler or in the steam space, and the. pipe 8 leads to thesame boiler and enters the same below the normal level ofthe water in the boiler or in the water space in the boiler.

The outletvalve 9 is positioned in the cas ing 5 and consists of a valve casing 10 provided with ports 10, a valve member 11, and a valve stem 12 which is bifurcated at its upper end at 13. The valve member 11 bears,

against a valveseat 14 when the; valve is I closed. The valve seat 14 is screw threaded torreceive the lower end of the valve casing" 10 and is also screw threaded at its lower end to engage aflange l5 which-is fastened to the base 16..of the casing 5.

' Aninlet valve .17 is also positioned within thelcasingaand-consists of avalve casing 18' PI'OViClGClWlt-h ports18, a valve member 19 and alva'lve stem 20 which is bifurcatedat its upperend at21. The valve member 19 rests against a valve seat 22 when the valve 17 is closed, the valve seat 22 being screw threaded atits upper end to receive the valve casing 18 and at its lower end to engage the flangel5.

At the rear of the valve 17 is a'standard 23 which has screw-threaded engagementlwith the flange 15 and is bifurcated at 24at its upper end.; a w v s A. float 25 is provided within the casing-'5 and'is fastened to, afloat lever 26. The 'float lever-26B pivoted to a pivotro'd 27 which 1 95 extends through thebifurcatedupper end 21 of the valve stenifQO of the inlet valve 17. The pivot rod .27 extends beyond the bifur} catedportion .Zlofthe-valve stem 20 in-oppo site directions and engages counter-weightle vers 28 and 29 which are pivoted to a pivotal" through the ports 18.

pin 30 fast to the standard 23. The counterweight levers 28 and 29 have counter-weights 31 and 32 adjustably mounted thereon and located in position relatively thereto by screws 33 and 3e respectively.

The float lever 26 is positioned between the two sides'of the bifurcated end 21 of the valve stem 20 and it also passes through the space between the two sides of the bifurcated portion 13 of the valve stem 12. The said float lever 26 is connected to the valve stem 12 by a pivotal pin 36 which projects through the float lever 26 and through slots 37 in the bifurcated portion 13 of the valve stem 12.

The general operation of the apparatus hereinbefore described is as follows Assuming the .pipe 7 to be connected to aboiler above the normal level of the water therein and the pipe 8 to be connected to the same boiler below the normal level of the water therein, then the water38 in the casing 5 will stand at the level of the line A as indicated in Fig. 1. Assuming now that the level of the water is below the normal level A, then the float 25 will move downwardly bringing its lever 26 to the position illustrated in Fig. 3. This will cause the lever to pivot on the pin 36 and to thus be supported onthe valve member 11 and will cause the valve member 19to be raised by means of the pin 27. Water will then enter the valve chamber of the valve 17 through the water inlet pipe 39, the valve member 19 then being opened as illustrated in Fig. 3 and the water entering the casing 5 This will cause the level of the water in the casing 5 to rise to'the normal level A and will raise the float 25 to the position illustrated in Fig. 1, the float I lever being pivoted on the pin 36 will cause the valve member 19 to be closed through the pin 27 and valve stem20.

If the level of the water in the casing 5 rises above the line A then the diflerent parts of the apparatus will assume the positions illustrated in Fig. 4, that is, the valve 11 will be opened to let water out of the casing through the ports 10 and through the water outlet pipe by reason of the float 25 moving upwardly, thus raising the float lever 26 which is pivotally mounted on the pivotal pin 27 and is thus supported on the valve member 19 and through the pivotal pin 36 raising the valve member 11 to open the outlet valve 9. 1

When the parts of the apparatus are moved from the positionillustrated in Fig. '1 to that illustrated in Fig. 3 itwill be seen that .the counter-weights 31 and 32 acting through their respective levers 28 and 29 will tend to move the valve 19 downwardly against its seat 22 thus closing the valve 17, and when the parts are in the relative positions illustrated in Fig. 4 the said counter-weights and their levers will hold the valve member 19 against its seat 22.

and operates to open the valve 9.

It will be noted that both the inlet valve and the outlet valve are completely submerged in water and are positioned so that they are completely submerged when the water stands at a normal level or for a'considerable distance below the normal level as illustrated in Fig. 1. This is an important feature in this invention as it makes the operation of opening and closing the valves very much easier.

Attention is also called to the operationof the weights 31 and 32 and their levers 28 and 29 andthese weights operating to close the -inlet valve against the water under pressure, which enters the inlet valve. The weights not only close the valve 19, but hold it closed, or in other words, lock it against the inlet of the water under pressure until such time 'as the valve is opened as hereinbefore described, by the rising of the water in the casing above the normal level A.

Another important matter in relation to the counterweights is that these counterweights 31 and 32 are adjustable longitudinally on their respective levers 28 and 29 toward and away from the pivot 30 and this renders it possible with the apparatus of this invention to adjust the counterweights for varyin pressures of water at the inlet valve, so that just the right amount of weight may be utilized to close the inlet valve and hold it closed and therefore make it easier for the float when itdescends in the casing, due to the water level being lowered, to raise the weights and open the inlet valve.

WVe claim:

1. A water level control having, in combi nation, a closed casing, connections leading from said casing to a boiler above and below the water line in said boiler respectively, an inlet valve in said casing connected to a source of water under pressure, an outlet valve in said casing connected to an outlet passage from said casing, a float, anda float lever pivotally connected to each of said valves, in such xmanner that when said float rises above a predetermined level the outlet valve will be opened and the inlet valve closed and the float lever be pivotally supported upon the inlet valve and vice .versa.

2. A water level control having,.in combination, a closed casing, connections leading from said casing to a boiler above and below the water line in said boiler respectively, an inlet valve in said casing connected to asource of water under pressure, an outlet valve in said casing connected to an outlet passage from said casing, a float, a float lever pivotally connected to each of said valves, whereby when said float rises above a'predetermined 1 level the outlet valve will be opened and the inlet valve closed and vice Versa, and a Weight connected to said float lever and acting to close said inletvalve. V

r 3. A water level control having, in combination, a closed casing, connections leading from said casing to a boiler above and below the water line in said boiler respectively, an inlet valve in said casing connected toa source of water under pressure, an outlet valve in said casing connected to an outlet passage from said casing, a float, a float lever pivotally connected toeach of said valves,

whereby when said float rises above a prede-- termined level the outlet valve will be opened and the inlet valve closed and vice versa, and

a weight adjustably connected to said float bination, a closed casing, aninlet valve in lever and acting to close said inlet valve.

4. A water level control having, in combination, a closed casing, an inlet valve in said casing connected to a source of water under pressure, a float, a float lever pivotedto said inlet valve, and an outlet valve in said casing connected to said float lever between the float and inlet valve, whereby when said float rises above a predetermined level the outlet valve will be opened and the inlet valve closed and vice versa.

5. A water level control having, in combination, a closed casing, an inlet valve in said casing connected to a source of water under pressure, a float, a float lever pivoted to said inlet valve, an outlet valve in said casing connected to saidfloat lever between the float and inlet valve, whereby when said float rises above a predetermined level the outlet valve will be opened and the inlet valve closed and vice versa, and a weight connected to said above a predetermined level the outlet valve 6. A water level control having, in combination, a closed casing, connection leading from said casing to a boiler above and below the water line in said boiler respectively, an inlet valve in said casing connectedto a source of water under pressure, an outlet valve in said casing connected to an outlet passage from said casing, a float, and afloat lever pivotally connected to each of said valves, said valves both being closed when the float is at a normal level, the inlet valve being opened. when the float moves downwardly and below said normallevel and the outlet valve being opened when the float moves upwardly above said normal level, the float lever being pivotally supported upon the respective closed valve. 1

7 .A water level control having, in combination, a closed casing, an inlet valve in said casing connected-to a source of water under pressure, a valve stem projecting upwardly from said valve,'a pivot" onsaid valve stem, a float lever pivotally supported on said last-named pivot when said inlet valve is closed, a float on said lever, a counter-weight lever spaced apart from said float lever positionedin said' casing and connected to said pivot, andfa'counter-weight on said counter-weight lever. j "8. A water level control having, in com bination, a closed casing, an inlet valve in said casing connectedqto a source of water under pressure, a valve stem projecting upwardly*froins'aid valve,-a pivot on said valve stem, a float lever pivotally supported onsaid last-namedpivot when said inlet valve is closed, a floaton said lever, acounter-weight lever positioned inside said "casing, spaced apart from said float lever and connected to said pivot, and a counter-weight on said counter-Weight lever and adjustable longitudinally thereof.

9. A water level control having, in comsaid casing connected to a source of Water under pressure, a valve stem projecting up wardly from said valve, a pivot on said valve stem, a float lever pivoted to said last-named pivot, a float on said lever, an outlet valve in'said casing, and a valve stem projecting upwardly from said outlet valve and pivotally connected to the float lever, between the inlet valve stem pivotand the float.

10. A water level control having, in combination, a casing, an inlet valve, an outlet valve and a float in said casing, means; operable by the rise and fall of said float, due to the change in the water level in said casing, to open or close'said valves, and a weight connected to said inlet valve and acting to close the same. I

V 11. A water level control having, in combination, a casing, an inlet valve, an outlet valve and a float in said casing, means operable by the rise and fall of said float, due to e the change in the water level in said casing,

to open or close said valves, and a pivotally passage from said casing, a float, a float lever" pivotally connected to each of said valves, whereby when said float rises above a predetermined level the outlet valve will be opened and the inlet valve closed and vice versa, and a weight connected to said float lever and acting to close said inlet valveand hold it closed while the water level in said casing stands at or above a predetermined normal level.

13.. A water'level control having, in combination, a casing, an inlet valve, an outlet valve and afloat in said casing, and means a pivotally connected to said valve and operable by the rise and fall of said float, due to 4 nwe eae the chwgein the water level in eaid casing, to open or close "said valves alternately, said inlet and outlet valves being submerged while the Walter levelin,saidtcasiugsta nds approxi-m-ately at a predeterminedrnormal vLevel 

